Dewey

iTrader: (1)

Ok will someone please explain what it means to spin a bearing? I thought the whole point of a bearing was to spin with as little friction is possible.

trippinholyman

basically, you spin it so fast that it loses its tolerance and flops around, causing all sorts of **** to hit into other **** that it shouldnt. a bearing that was a couple bucks could put a piston shaped hole in your motor, for instance on the more extreme side

SparkyJJO

iTrader: (11)

One part of the bearing doesn't (where it mounts) and one part does (the rotating part).

A spun bearing is when the whole darn thing moves, or it was spun too much and wore it out, making it loose. Something along those lines I think.

I've been there, done that. Not fun.

z28hustle

spun bearing = motor rebuild ... long story short

Ls1Rook

iTrader: (1)

LOL^ true

Sharpe

iTrader: (7)

The way I understand it, either a rod or main bearing fuses to the crank, causing it to spin inside the cap/rod. That's why they call it a "spun" bearing. I could be wrong, though.

Dewey

iTrader: (1)

okay thanks for clearing that up. I keep hearing about peoples' spun rod and main bearings and i'm thinking what the hell.

trippinholyman

yeah excuse my crappy horrible explanation, but it means bad news x 4 hehe

hope you dont have one op!

KENS_SS_4

In the car motor context: First a bearing (rod or main) is a ring cut into two half circle solid pieces clamped in place with little tabs that prevent them from spinning, they are stationary. Oil is pumped into the space between the bearing cap and main and rod journals. This space is very tight when it wears excessively then the bearing can move enough that the tabs come out of their slots and they spin in the main caps or rod ends.
Here is a nice post on wiki with pics

http://www.fixrambler.com/art38.html

tripps

iTrader: (7)

Good thing you just want to know what it means, instead of how to fix it once it happens!

Dewey

iTrader: (1)

well, my truck isn't modded so i shouldnt have to worry right?
BTW, what does OP stand for

chpmnsws6

iTrader: (70)

A stock engine can spin a bearing just as easily.

Original Post(er)

Dewey

iTrader: (1)

hmm, how does one go about spinning a bearing exactly?

Sharpe

iTrader: (7)

Normally oiling problems; running low on oil, dirty oil, low oil pressure...

samson_420

iTrader: (1)

I never make it to the "spun bearing" stage. . . . I always seem to get the hole in piston desease. . .

landonew

It means you have to break out your piggy bank.

Don't ask me how I know this.... My piggy bank has been broken out a time or two, lol!

But hey... That's racing!

SparkyJJO

iTrader: (11)

Unless you're like me and spin a bearing just cruising down the highway. "Hey, what's that clacking noise... crap."

CR71

A spun bearing can also ruin the entire motor not just the the bearing that spun and the surface it was touching. If a bearing spins it can cover the oil passage and starve the rest of the motor for oil causing the whole thing to eats itself apart.

araber89

iTrader: (3)

Ok if it happens just drop the oil pan and put your cheap new bearing in filler up with oil and run 'er. JK its worse then that. Well if it needs honing just take some sand paper to the block. Whatever you can reach.

Ok on a serious note. Its what the guys have been saying. It sucks if you do it but then you can do your build the way you want it.

T/AWS6969

Dont some stores sell that engine tune up and rebuild crap for 10 to 15 dollars. LOL JKN!!!